. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 148 The palatine teeth of the alternating series are 6—7 in number, and are all fully formed in an individual 18 cm in length. After this period there is a temporary cessation of tooth formation, and on its recommencement the teeth are, as in the other cases, uniform in size (Fig. 4 b). At a stage when the anterior members of the uniform series are only just beginning to develop in the palatines, there are already several fully formed in the lower jaw, but no trace of them in the maxilla. The vomerine teeth, when present, app
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. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 148 The palatine teeth of the alternating series are 6—7 in number, and are all fully formed in an individual 18 cm in length. After this period there is a temporary cessation of tooth formation, and on its recommencement the teeth are, as in the other cases, uniform in size (Fig. 4 b). At a stage when the anterior members of the uniform series are only just beginning to develop in the palatines, there are already several fully formed in the lower jaw, but no trace of them in the maxilla. The vomerine teeth, when present, appear to commence their development towards the end of the incubation period. They aiford no satisfactory data bearing on the question to be discussed. St E.d. St ' m^iii^. den.. Fig. 5. Sagittal section of mandibular alternating teeth (seventh and eighth, right side), illustrating fusion which occurs between the teeth of two dentitions, den. dentary, E. d. tooth of embryonic dentition, within the epidermis, St. remains of stellate tissue of enamel organs, sp. shrinkage cavity. (Embryo in last month of incubation. Length of skiül 11, 5 mm. X 100.) opposing teeth. It is possible that in some cases the lower teeth have three components, though my specimens do not support this view. In most of the existing figures the amount of tooth substance is exaggerated, especially in the case of the premaxillary. This is partly owing to the mistaken idea that each premaxilla had one large tooth, notched at the apex. A more recent view, that the form of the front teeth is due to fusion, is equally erroneous. There is no fusion, and the appearances are entirely due to the close relations of the simple, sub-conical teeth, to the bone, which grows out some distance beyond the gums and is subject to the grinding action of the opposing jaw, after the enamel and dentine are worn away.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea